target/linux/ramips/files/arch/mips/ralink/rt288x/setup.c

   1 /*
   2  * Ralink RT288x SoC specific setup
   3  *
   4  * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
   5  * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  * Parts of this file are based on Ralink's 2.6.21 BSP
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License version 2 as published
  11  * by the Free Software Foundation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/io.h>
  17 #include <linux/serial_8250.h>
  18
  19 #include <asm/mips_machine.h>
  20 #include <asm/reboot.h>
  21 #include <asm/time.h>
  22
  23 #include <asm/mach-ralink/common.h>
  24 #include <asm/mach-ralink/rt288x.h>
  25 #include <asm/mach-ralink/rt288x_regs.h>
  26
  27 static void rt288x_restart(char *command)
  28 {
  29         rt288x_sysc_wr(RT2880_RESET_SYSTEM, SYSC_REG_RESET_CTRL);
  30         while (1)
  31                 if (cpu_wait)
  32                         cpu_wait();
  33 }
  34
  35 static void rt288x_halt(void)
  36 {
  37         while (1)
  38                 cpu_wait();
  39 }
  40
  41 static void __init rt288x_early_serial_setup(void)
  42 {
  43         struct uart_port p;
  44         int err;
  45
  46         memset(&p, 0, sizeof(p));
  47         p.flags         = UPF_SKIP_TEST;
  48         p.iotype        = UPIO_AU;
  49         p.uartclk       = rt288x_sys_freq;
  50         p.regshift      = 2;
  51         p.type          = PORT_16550A;
  52
  53         p.mapbase       = RT2880_UART0_BASE;
  54         p.membase       = ioremap_nocache(p.mapbase, RT2880_UART0_SIZE);
  55         p.line          = 0;
  56         p.irq           = RT2880_INTC_IRQ_UART0;
  57
  58         err = early_serial_setup(&p);
  59         if (err)
  60                 printk(KERN_ERR "RT288x: early UART0 registration failed %d\n",
  61                         err);
  62
  63         p.mapbase       = RT2880_UART1_BASE;
  64         p.membase       = ioremap_nocache(p.mapbase, RT2880_UART1_SIZE);
  65         p.line          = 1;
  66         p.irq           = RT2880_INTC_IRQ_UART1;
  67
  68         err = early_serial_setup(&p);
  69         if (err)
  70                 printk(KERN_ERR "RT288x: early UART1 registration failed %d\n",
  71                         err);
  72 }
  73
  74 unsigned int __cpuinit get_c0_compare_irq(void)
  75 {
  76         return CP0_LEGACY_COMPARE_IRQ;
  77 }
  78
  79 void __init ramips_soc_setup(void)
  80 {
  81         rt288x_sysc_base = ioremap_nocache(RT2880_SYSC_BASE, RT2880_SYSC_SIZE);
  82         rt288x_memc_base = ioremap_nocache(RT2880_MEMC_BASE, RT2880_MEMC_SIZE);
  83
  84         rt288x_detect_sys_type();
  85         rt288x_detect_sys_freq();
  86
  87         printk(KERN_INFO "%s running at %lu.%02lu MHz\n", ramips_sys_type,
  88                 rt288x_cpu_freq / 1000000,
  89                 (rt288x_cpu_freq % 1000000) * 100 / 1000000);
  90
  91         _machine_restart = rt288x_restart;
  92         _machine_halt = rt288x_halt;
  93         pm_power_off = rt288x_halt;
  94
  95         rt288x_early_serial_setup();
  96 }
  97
  98 void __init plat_time_init(void)
  99 {
 100         mips_hpt_frequency = rt288x_cpu_freq / 2;
 101 }